Simple Calender & Small time
Also a very handy tool to track your time & take notes of when a critical injury is healed etc. If you're into it, it can automatically adjust the brightness depending on the time of day. If I recall correctly, you first activate the calender and import the official modules after that, the calender will be automatically set up for you. But someone should elaborate on this further / give me time to research / research-try it themselves.